the state for which to set the background color
the color to assign, or %NULL to undo the effect of previous calls to gtk_widget_override_background_color()
Deprecated: This function is not useful in the context of CSS-based rendering. If you wish to change the way a widget renders its background you should use a custom CSS style, through an application-specific #GtkStyleProvider and a CSS style class. You can also override the default drawing of a widget through the #GtkWidget::draw signal, and use Cairo to draw a specific color, regardless of the CSS style.
3.0
Sets the background color to use for a widget.
All other style values are left untouched. See gtk_widget_override_color().